Worksheet 9
Due:
NAME:__________________________________________________________
Biology BI102
Worksheets MUST be hand written and will not be accepted as a typed document.
CH 18
What is
microevolution? What
four mechanisms can
contribute to
microevolution?
What is allele
frequency and how
does it relate to
microevolution?
What is the difference
between allele
frequency and
genotype frequency?
What is gene flow?
Give an example of
gene flow.
Explain how gene flow
can counteract the role
mutations, genetic
drift, and natural
selection plays in
microevolution.
What is genetic drift?
Give an example of
genetic drift.
Why are the effects of
genetic drift more
important in smaller
populations?
What does it mean
when an allele is fixed?
What is a genetic
bottleneck. Give an
example of one.
What is founder
effect? How does this
the resulting
population?
Page 1 of 5
Explain how genetic
drift, gene flow, and
mutations can oppose
the effects of natural
selection?
Describe directional
selection and give an
example.
Describe stabilizing
selection and give an
example.
Describe disruptive
selection and give an
example.
What is sexual
selection and how
does it lead to sexual
dimorphism.
CH 19
What is an adaptive
trait? Give two
examples.
What is coevolution?
When does it occur?
What are the three
most important
characteristics of
evolutionary
adaptations? Explain
each.
Page 2 of 5
Give an example of
rapid evolution.
Do adaptations create
perfect organisms?
Explain.
Explain how the
following can limit
adaptations:
Lack of genetic variation:
Varied effect of developmental genes:
Ecological trade-offs:
Explain the
morphological species
concept. What are its
pros and cons?
What is reproductive
isolation? What are
the two types of
reproductive isolation?
Explain the two types
of postzygotic barriers:
Zygote death:
Hybrid performance:
Page 3 of 5
Explain the four types
of prezygotic barriers:
Ecological isolation:
Behavioral isolation:
Mechanical isolation:
Gametic isolation:
What is the biological
species concept? Why
is this better than the
two other purposed
ways to determine
species?
In what three ways
does the biological
species concept fail?
What is speciation and
what has it caused?
What is the main thing
that must happen for
speciation to occur?
Explain how the fruit
fly experiment on
pages 435-436
demonstrates the
initial steps of
speciation.
How does geological
isolation contribute to
speciation? Give an
example.
Page 4 of 5
Explain why speciation
requires gene flow to
stop.
1pt Extra Credit
***Understanding of ALL of the underlined terms in this document is needed to succeed in this class. To
further study these terms do one of the following:
Draw pictures with the terms
Make flash cards of all terms
Make a concept map of all terms (if you don’t know what this is look it up on Wikipedia)
Write out definitions of all terms
Or come up with your own way of studying these terms. Just make sure to ok it with me to make sure
you’ll get your extra credit.
You will get one point of extra credit for this part of the worksheet.
This must be turned in attached to this study guide at the time the study guide is due!!!!
What’s working
well and what’s a
suggestion to help
things work better?
Page 5 of 5